here is our situation, duke is a 150 lbs bloodhound german shepard mix he will be 4 in december for as long as we have had him since he as about 8 months he has never had a normal poop it has always been soft or loose. it like goes in a cycle he is ok with soft poop and then every so often he gets runny poop and then it is just water with the most horrific smell you can imagine. fyi he was shot like two years ago and he still has some beebeeies in him the vet said it was better than surgery for him. he has no physical effects from this. i am just wondering if maybe he may have some type of iron defficiency? does anyone know if dogs can handle iron supplements? thanks for your help.